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Soft-mode behavior and incipient ferroelectricity in Na1/2Bi1/2Cu3Ti4O12.

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F10%3A00347911" target="_blank" >RIV/68378271:_____/10:00347911 - isvavai.cz</a>

  • Result on the web

  • DOI - Digital Object Identifier

Alternative languages

  • Result language

    angličtina

  • Original language name

    Soft-mode behavior and incipient ferroelectricity in Na1/2Bi1/2Cu3Ti4O12.

  • Original language description

    Na1/2Bi1/2Cu3Ti4O12.(NBCTO) ceramics exhibit high intrinsic relative permittivity of 145 at 300 K that rises on cooling and levels off below 50 K with a value of 260 at 10 K without any signature of a structural transition. Such behavior is a typical feature of incipient ferroelectrics such as the perovskite CaTiO3. Infrared and terahertz spectroscopy on NBCTO ceramics are presented and reveal a room-temperature soft polar optic mode at 34 cm-1 that softens on cooling and is responsible for the temperature dependence of the relative permittivity. The temperature dependence of the soft-mode frequency obeys the Barrett formula with the onset of quantum fluctuations T1 occurring near 85 K and a hypothetical Curie temperature T0 of 155 K. A fitted vibrational zero-point energy (kBT1)/2 is in good agreement with the measured soft-mode frequency.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

  • CEP classification

    BM - Solid-state physics and magnetism

  • OECD FORD branch

Result continuities

  • Project

    <a href="/en/project/GA202%2F09%2F0682" target="_blank" >GA202/09/0682: Dielectric spectroscopy and lattice dynamics of magnetoelectric multiferroics and strained ferroelectric thin films</a><br>

  • Continuities

    Z - Vyzkumny zamer (s odkazem do CEZ)

Others

  • Publication year

    2010

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Physical Review. B

  • ISSN

    1098-0121

  • e-ISSN

  • Volume of the periodical

    81

  • Issue of the periodical within the volume

    22

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    6

  • Pages from-to

  • UT code for WoS article

    000279090100001

  • EID of the result in the Scopus database